Thanks. At my previous job, we used the G1 collector and still had issues with "stop the world" type pauses. G1 does a best effort, but I've had applications t

Thanks. At my previous job, we used the G1 collector and still had issues with "stop the world" type pauses. G1 does a best effort, but I've had applications that still experience rather long pauses (sometimes measured in seconds, usually hundreds of microseconds). I haven't used either CMS or G1 heavily since I joined Wallaroo Labs a couple years back so, I don't have first hand experience with either recently. Azul's Zing JVM does a really nice job of concurrent collection and if you can afford it, is a great way to improve the performance of clustered JVM applications.